class_docstr: Unit tests for the evolve function
docstr: Test that the evolve function returns a ParametrizedEvolution with `params=None` and `t=None`
  when the input is a ParametrizedHamiltonian.
docstr_tok: ["Test","that","the","evolve","function","returns","a","ParametrizedEvolution","with","`","params=None","`","and","`","t=None","`","when","the","input","is","a","ParametrizedHamiltonian","."]
code: def test_evolve_returns_parametrized_evolution(self):
      """Test that the evolve function returns a ParametrizedEvolution with `params=None` and `t=None`
      when the input is a ParametrizedHamiltonian."""
  
      def fun(p, t):
          return p[0] * qml.math.sin(p[1] * t)
  
      coeffs = [1, fun, 3]
      ops = [qml.PauliX(0), qml.PauliY(1), qml.PauliZ(2)]
      H = ParametrizedHamiltonian(coeffs=coeffs, observables=ops)
      final_op = qml.evolve(H)
      assert isinstance(final_op, ParametrizedEvolution)
      assert final_op.parameters == []
      assert final_op.t is None
      param_evolution = final_op(params=[[1, 2]], t=1)
      assert isinstance(param_evolution, ParametrizedEvolution)
      assert param_evolution.H is H
      assert qml.math.allequal(param_evolution.parameters, [[1, 2]])
      assert qml.math.allequal(param_evolution.t, [0, 1])
  
file_path: pennylane/tests/ops/functions/test_evolve.py
imports: import warnings
  import pytest
  import pennylane
  from pennylane.ops import Evolution
  from pennylane.pulse import ParametrizedEvolution, ParametrizedHamiltonian
label_desc: Use image node_id 4 for calling the TestEvolveConstructor obj's underlying member method code with example usage: obj.test_evolve_returns_parametrized_evolution() and returns: unknown